Wolves howl as a riderless horse returns at sunset to the Culpepper Dude Ranch in the Madison Valley. The missing woman, Nanika Martinelli, is known as the Fly Fishing Venus, a red-haired river guide who lures clients the way dry flies draw trout. As Sheriff Martha Ettinger follows hoof tracks in the snow, she finds one of the men who has fallen under the temptress's spell impaled on the antler tine of a giant bull elk, a kill that's been claimed by a wolf pack. An accident? With Sean Stranahan's help, Ettinger follows the clues.